IAEA RGTh-1 Reference Material - 0 - 200 keV -Practical Gamma-Ray Spectrometry

IAEA RGTh-1 Reference Material - 0 - 200 keV

Home Page | Examples Page | 200 - 700 keV | 700 - 1200 keV | 1200 - 2100 keV

This spectrum was measured using a 45% n-type detector, mounted in a standard 10cm thick cylindrical graded shield, in a routine laboratory at typical altitude with no special background suppression facilities. The material is IAEA RGTh-1 reference material. The spectrum represents 120 ml of that, measured in a cylindrical container stood on the detector face. Sample height was 41 mm. There is a small amount of uranium in this material and the spectrum contains peaks from the ^235,238U decay series from that and the natural background. The are a number of inidentified peaks in the spectrum that could well be coincidence sum peaks.

	Measured Energy (keV)	True Energy (keV)	Peak Counts	Nuclide	Emission Probability (%)	Source of radiation
1	12.93	11.85	4597	²¹²Bi	6.73	²³²Th series
		12.2		²⁰⁸Tl	2.89	²³²Th series
		12.56		²¹²Pb	14.5	²³²Th series
		12.75		²²⁸Ra	0.3	²³²Th series
		12.89		²¹⁴Pb	12.42	²³⁸U series (²²⁶Ra)
		12.9		²¹⁰Pb	23.2	²³⁸U series (²²⁶Ra)
		12.94		²¹⁴Bi	0.627	²³⁸U series (²²⁶Ra)
		12.94		²¹²Bi	0.0581	²³²Th series
		13.52		²²⁸Ra	1.6	²³²Th series
		13.7		²²⁶Ra	0.807	²³⁸U series (²²⁶Ra)
		13.71		²²⁴Ra	0.387	²³²Th series
2	15.49	14.52		²²⁸Th	8.8	²³²Th series
		14.92		²³⁰Th	8.5	²³⁸U series
		14.92		²³²Th	7.9	Primordial
		14.93		²²⁸Ra	1.13	²³²Th series
		15.31		²³⁸U	7.94	Primordial
		15.5		²²⁸Ra	0.16	²³²Th series
		15.75		²²⁸Ac	32.9	²³²Th series
		16.2		²²⁸Ra	0.7	²³²Th series
		16.48		²³⁴Th	9.6	²³⁸U series
		16.6		^234mPa	0.68	²³⁸U series
3	18.98	18.42	7656	²²⁸Ac	0.014	²³²Th series
4	39.82	39.86	49310	²¹²Bi	1.01	²³²Th series
5	42.53	42.46	7722	²²⁸Ac	0.009	²³²Th series
6	46.48	46.54	6677	²¹⁰Pb	4.25	²³⁸U series (²²⁶Ra)
7	57.84	56.96	23170	²²⁸Ac	0.019	²³²Th series
		57.76		²²⁸Ac	0.47	²³²Th series
8	63.28	63.28	20465	²³⁴Th	4.8	²³⁸U series
		63.81		²³²Th	0.27	Primordial
9	72.86	72.8	53956	²⁰⁸Tl	2.15	²³²Th series
		72.87		²¹²Bi	0.095	²³²Th series
10	74.86	74.82	630005	²¹⁴Pb	6.26	²³⁸U series (²²⁶Ra)
		74.82		²¹²Pb	10.7	²³²Th series
		74.97		²⁰⁸Tl	3.61	²³²Th series
11	77.14	76.86	953877	²¹²Bi	0.0404	²³²Th series
		77.11		²¹⁴Pb	10.47	²³⁸U series (²²⁶Ra)
		77.11		²¹²Pb	17.9	²³²Th series
		77.34		²²⁸Ac	0.026	²³²Th series
12	81.14	81.07	5386	²²⁴Ra	0.13	²³²Th series
		81.07		²²⁸Ra	1.76	²³²Th series
13	84.39	83.78	103039	²²⁴Ra	0.215	²³²Th series
		83.78		²²⁸Ra	2.9	²³²Th series
		84.37		²²⁸Th	1.17	²³²Th series
		84.95		²⁰⁸Tl	1.23	²³²Th series
		85.14		²¹²Bi	0.0096	²³²Th series
		85.43		²²⁸Th	0.0172	²³²Th series
14	87.22	87.35	315302	²¹⁴Pb	3.59	²³⁸U series (²²⁶Ra)
		87.35		²¹²Pb	6.12	²³²Th series
		87.58		²⁰⁸Tl	0.373	²³²Th series
		88.47		²²⁸Th	0.0281	²³²Th series
15	89.98	89.75	237405	²¹²Bi	0.0231	²³²Th series
		89.95		²²⁸Ac	0.931	²³²Th series
		90.08		²¹⁴Pb	1.1	²³⁸U series (²²⁶Ra)
		90.14		²¹²Pb	1.87	²³²Th series
16	93.36	92.37	225767	²³⁴Th	2.81	²³⁸U series
		92.68		²¹²Bi	0.0072	²³²Th series
		92.79		²³⁴Th	2.77	²³⁸U series
		93.35		²²⁸Ac	1.507	²³²Th series
17	99.56	99.51	59867	²²⁸Ac	1.26	²³²Th series
		100.1		²²⁸Th	0.0098	²³²Th series
		100.41		²²⁸Ac	0.093	²³²Th series
18	105.36	105.55	83179	²²⁸Ac	0.536	²³²Th series
19	108.85	108.97	28056	²²⁸Ac	0.181	²³²Th series
20	115.23	114.56	32733	²²⁸Ac	0.0098	²³²Th series
		115.18		²¹²Pb	0.623	²³²Th series
21	129.06	129.06	121204	²²⁸Ac	2.42	²³²Th series
22	131.64	131.61	7938	²²⁸Th	0.124	²³²Th series
23	141.05	140.88	2208	²³²Th	0.022	Primordial
		141.01		²²⁸Ac	0.05	²³²Th series
24	145.93	145.85	7593	²²⁸Ac	0.158	²³²Th series
25	153.99	153.98	36573	²²⁸Ac	0.722	²³²Th series
26	166.35	166.41	5531	²²⁸Th	0.094	²³²Th series
27	173.93	173.96	1207	²²⁸Ac	0.035	²³²Th series
28	176.62	176.64	2669	²¹²Pb	0.052	²³²Th series
29	184.38	184.54	3078	²²⁸Ac	0.07	²³²Th series
30	186.21	186.21	10430	²²⁶Ra	3.555	²³⁸U series (²²⁶Ra)
31	191.48	191.36	3975	²²⁸Ac	0.123	²³²Th series
32	199.35	199.41	12443	²²⁸Ac	0.315	²³²Th series

This website was created by Dr Gordon Gilmore for the benefit of readers of Practical Gamma-Ray Spectrometry (3rd Edition).

Problems with this page? Report it on the Feedback page.